Determination of the Center of Radial Distortion for a Camera Lens

2020 ◽  
Vol 69 (9) ◽  
pp. 7015-7027
Author(s):  
Pablo Vera ◽  
Octavio Icasio-Hernandez ◽  
Joaquin Salas
Keyword(s):  
Camera Lens ◽  
Radial Distortion

A new phase to height model in fringe projection profilometry by considering radial distortion of camera lens

Optik ◽  
2021 ◽  
pp. 167895
Author(s):  
Jong-Chol Kang ◽  
Chol-Su Kim ◽  
Il-Jun Pak ◽  
Ju-Ryong Son ◽  
Chol-Sun Kim
Keyword(s):  
Fringe Projection ◽  
Camera Lens ◽  
Radial Distortion ◽  
New Phase ◽  
Height Model ◽  
Fringe Projection Profilometry

Camera lens radial distortion correction using two-view projective invariants

2011 ◽  
Vol 36 (24) ◽  
pp. 4734 ◽  
Author(s):  
Xin Du ◽  
Hongdong Li ◽  
Yunfang Zhu
Keyword(s):  
Distortion Correction ◽  
Projective Invariants ◽  
Camera Lens ◽  
Radial Distortion

scholarly journals Determination of Transmittance of IR Windows made of CaF2 within Operational Temperatures of Electric Devices

2021 ◽  
Vol 25 (4) ◽  
pp. 25-30
Author(s):  
Krzysztof Dziarski ◽  
Arkadiusz Hulewicz
Keyword(s):  
Temperature Measurement ◽  
Measurement System ◽  
Ir Radiation ◽  
Camera Lens ◽  
Electric Device ◽  
Literary Sources

The article presents summaries of works which have resulted in the presentation of a formula making it possible to determine an approximate transmittance of an IR window used in thermographic measurements of electric device temperatures. The equation was formulated after analysing components of the IR radiation reaching the camera lens in case when an IR window was not used and when an IR window was used. Conditions prevailing in course of the thermographic temperature measurement of electric devices contained in the switchgear were recreated in the performance of the works. The measurement system which was used in the experiment has been presented. Components of the IR radiation reaching the camera lens in case when the IR window was used and when the IR window was not used have been discussed. The obtained transmittance results of windows VPFR-75 FRK100-CL have been compared against data from literary sources.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

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